增加换肤功能

Pods/Protobuf/objectivec/GPBUnknownFields+Additions.swift

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+// Protocol Buffers - Google's data interchange format
+// Copyright 2024 Google Inc.  All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file or at
+// https://developers.google.com/open-source/licenses/bsd
+
+/// Swift specific additions to simplify usage.
+extension GPBUnknownFields {
+
+  /// Fetches the first varint for the given field number.
+  public func firstVarint(_ fieldNumber: Int32) -> UInt64? {
+    var value: UInt64 = 0
+    guard getFirst(fieldNumber, varint: &value) else { return nil }
+    return value
+  }
+
+  /// Fetches the first fixed32 for the given field number.
+  public func firstFixed32(_ fieldNumber: Int32) -> UInt32? {
+    var value: UInt32 = 0
+    guard getFirst(fieldNumber, fixed32: &value) else { return nil }
+    return value
+  }
+
+  /// Fetches the first fixed64 for the given field number.
+  public func firstFixed64(_ fieldNumber: Int32) -> UInt64? {
+    var value: UInt64 = 0
+    guard getFirst(fieldNumber, fixed64: &value) else { return nil }
+    return value
+  }
+
+}
+
+/// Map the `NSFastEnumeration` support to a Swift `Sequence`.
+extension GPBUnknownFields: Sequence {
+  public typealias Element = GPBUnknownField
+
+  public struct Iterator: IteratorProtocol {
+    var iter: NSFastEnumerationIterator
+
+    init(_ fields: NSFastEnumeration) {
+      self.iter = NSFastEnumerationIterator(fields)
+    }
+
+    public mutating func next() -> GPBUnknownField? {
+      return iter.next() as? GPBUnknownField
+    }
+  }
+
+  public func makeIterator() -> Iterator {
+    return Iterator(self)
+  }
+}